Magnet for injection moulding machine hopper - UP - model L

Magnetic grid (Magnet for hopper) is designed exclusively for industrial use in the plastics industry in injection moulding machine hoppers. It ensures perfect cleaning of your granulates, regranulates or crumbles from ferromagnetic impurities (by ferromagnetic impurities we mean fully magnetic metals such as iron, nickel, cobalt and iron-containing alloys, not paramagnetic, very finely magnetic materials).

For proper operation, the materials to be purified must be:

• homogeneous,
• dry with good spreading properties to prevent clogging of the magnetic grid, see below.

The magnetic grate is suitable for use only in non-continuous operations (during manual cleaning of the magnetic grate, the flow of material to be cleaned must be stopped). It is installed only in hoppers above the injection moulding machines, the tube must be horizontal (in the event that vertical installation is not possible, do not use this product and contact us to find another magnetic grate (magnetic separator) or to confirm the suitability of its use).

The magnetic grid is used to protect the technology (injection moulding) so that metal ferromagnetic impurities do not get into the injection nozzles and thus prevent clogging and damage. It can also be used to purify the mixture to the highest possible cleanliness when the grate is placed at the end of the production process just before packaging, shipping (placing only in conical hoppers and using only for plastic granulates, regranulates, crumbles) so that there is no more contamination with metal ferromagnetic material during further operations in the production plant. In this case, immediate enclosure of the purified material in sealable containers or in other sealable containers is envisaged. Due to the well designed magnetic circuit and the labyrinth chute, a high capture of ferromagnetic impurities is achieved (please read in detail below the description of what ferromagnetic metallic impurities can be captured by this magnetic grid).

The grain size (fraction, size) of the material to be cleaned may be up to a maximum of 3 mm (3x3x3 mm) in diameter, regular in shape, the material must be well flowable, dry, non-sticky and free of lumps to avoid clogging (blocking) of the magnetic grid with material. The term "good flowable material" used in this description means material which does not have the property of arching (clumping together into uniform units) when spontaneously flowing and thus preventing free flow over the magnetic grid. The materials that we recommend and which, in our professional opinion and experience, are suitable for spreading (purification) over this magnetic grid are listed below (please note the maximum permissible fraction/grain size mentioned above). In the event that the material from which you require metallic ferromagnetic impurities to be separated (material to be purified) is not found in the listing below, do not use this product and contact us for further clarification and possible recommendation of another magnetic separator/grid or agreement that this type is also suitable for use for magnetic separation from your material.

Listing of suitable materials for magnetic separation using a magnetic grid:

- any plastic granulate, regranulate or plastic grit (for grit, please note the possibility of residual fibres after crushing, which may clog the magnetic grid)

If your plastic materials are bonded with glass fibre, please note the possibility of increased abrasion. The plastic cover tubes may be penetrated.

Again, we emphasize that the materials must be dry, well-friable (must not have arching properties), non-abrasive in maximum regular granulometry up to a diameter of 3 mm (3x3x3 mm). The permeability capacity varies depending on the type of material from which you wish to separate the ferromagnetic impurities (granulate, regranulate, grit), it cannot be clearly determined, it varies for each type of material. If you are not sure of the permeability, do not use this magnetic grate, contact our sales and technical department to recommend another type of magnetic separator or to approve the use of this type.

Please note that the wall thickness of the cover tube is very small due to the high magnetic induction (magnetic force) and breakaway force on its surface. Therefore, please also consider the height from which you will pour the material onto the magnetic grid (impact height). The height from which the material is poured onto the magnetic grid must not exceed 0.3 m. However, this is individual for each type of material. It is not possible to determine and prescribe exactly which material is to be spread from which height. In the case of spreading from a great height, the cover tubes may be punctured and the entire product damaged. If the height from which your material is to be spread on the magnetic grid is higher than 0.3 m, do not use this product and contact our sales and technical department to recommend another type of magnetic separator/grid or to approve the use of this type.

This magnetic grate picks up (separates) metal ferromagnetic particles from 1 µm and smaller (characteristically ferromagnetic, immeasurable, magnetic dust) up to a size of 3 mm (3x3x3 mm), which is the maximum fraction (size) of material that can fall on the magnetic grate and that can be poured over the magnetic grate. In rare cases, the magnetic grate can also capture larger metal objects up to a size of 5 mm (5x5x5 mm). However, the incidental occurrence of these impurities is assumed to be up to a maximum of 1% of the total hourly capacity of the material to be screened (regular cleaning of the magnetic grate of ferromagnetic impurities is assumed, this is not meant to imply that the entire 1% of larger, ferromagnetic impurities may remain on the magnetic grate for the entire duration of the hourly capacity of the material to be screened). The content of these larger ferromagnetic impurities must not be higher. If the presence of these larger ferromagnetic impurities in your material is higher, do not use this magnetic grate and contact our sales and technical department for expert advice.

The magnetic grid must not be hit by objects larger than we specify (max. diameter 3 mm, 3x3x3 mm) except for ferromagnetic impurities, which we describe above in random amounts. In case you are concerned about the presence of larger ferromagnetic or other impurities, it is necessary to pre-set the sieve with a mesh size of max. 5 mm, so that these larger, unwanted objects are caught already before entering the magnetic grid (after installing the sieve, it is necessary to consider reducing the capacity load, permeability, of the magnetic grid). The sieve is not included in the delivery of the magnetic grid. Please also note that your material may contain a large amount of fine metallic impurities (very fine metallic magnetic dust of less than 1 µm in size) which can coat the magnetic tubes and make the magnetic grid uncomfortable (the fine magnetic particles also pack the material being transferred and overwhelm the entire system). At the same time, the magnetic force/efficiency of the magnetic grid is greatly reduced. In case your magnetic tubes immediately after starting to pass the material through the magnetic grate become coated and "hide" entirely in iron dust this is not a defect of the magnetic grate, but you need to strengthen the magnetic separation with another magnetic separator/grid or clean the magnetic grate more often, your material probably contains a very large amount of ferromagnetic particles.

If you are unable to provide:

- absence of particles in your material larger than 3 mm (3x3x3 mm) in diameter

- less than 1% of larger ferromagnetic particles (up to 5 mm) in hourly capacity

- minimal metallic fine dust in your material

do not use this magnetic grid and contact our sales and technical department to recommend a different type of magnetic separator or to approve the use of this type. 

The magnetic grid is designed to capture as much ferromagnetic metallic impurities as possible. However, it all depends on the amount of these ferromagnetic impurities present in your material. It is not possible to guarantee the capture of all ferromagnetic impurities. The specific technology and capacities must always be considered. If necessary, additional types of magnetic separation/magnetic grids should be added or retrofitted. Please do not rely solely on this one magnetic grid. If you are unsure, do not use this type of magnetic grate and contact our magnetic separation experts at any time.

Do not use a magnetic grate to separate stainless steel (generally referred to as stainless steel), even if it appears to be magnetic/paramagnetic (such are, for example, after passing through various crushers or other forms of deformation, just as these paramagnetic stainless steels can be used to make various sieves).

The magnetic grate is not intended for magnetic separation of non-magnetic non-ferrous metals nor for magnetic separation of parts or parts containing ferromagnetic metals (e.g. plastic parts with pressed-in metal parts). In case you need to separate such ferromagnetic impurities, do not use this magnetic grid and contact our magnetic separation experts who will advise you which other magnetic separator to use or which type to add to your separation set-up.

Please note that it is not possible to use pressurised water or soak the magnetic cores during cleaning of the magnetic grid. Only a dry cloth may be used for cleaning or well-dried pressurized air (max. 2 bar) for blowing off residual metallic dirt and separated material.

Be very careful when cleaning the magnetic grid, the magnetic cores are very strong and attaching them to metal objects can cause pinching, pressure-squeezing injuries. Do not place on anything magnetic (tables, ponks, staircases, floors...).

This magnetic grid is not intended for use in any environment that is classified as an explosive atmosphere (ATEX). It is also not intended for direct contact with food.

The magnetic grid is for indoor use only. Do not install outdoors.

Magnetic induction measurement procedure

The measurements are made with a standard gaussmeter with a 0.75 mm probe at the point with the highest magnetic induction - at the location of the pole extensions or at the lowest point of the magnetic circuit arc. Repeat the test 3 times, always at a different point of the magnetic circuit, and calculate the average magnetic induction.

Procedure for measuring the breakaway force

Measure with a polished steel standard with a diameter of 10 mm and a height of 20 mm. The measurements are taken at the point with the highest breakaway force - at the point of the pole extensions or at the lowest point of the arc of the magnetic circuit. Record the force at which the etalon was torn off. Repeat the test 3 times and calculate the average breakaway force.

For your information 10 N = approx. 1 kg.

As a confirmation of the measurement and guarantee of the measured values, we issue and include in the delivery of each piece of magnetic separator an original measurement report issued just for your specific magnetic grid (on the report we indicate the stock and serial number).

Operating temperature:

-20 °C to +45 °C (-4 °F to +113 °F)

Exceeding the operating temperature is possible in some cases, but it is important to note that this can lead to impaired functionality or reduced equipment life. In this case, consultation with the manufacturer is necessary to clarify the extent to which the equipment can be exposed to higher temperatures without damage and maintain safe operation.

WARNING:

The resulting breakaway force and magnetic induction depend on many factors - e.g. the dimensions of the standard, the air gap between the standard and the magnetic circuit under test, the thickness of the measuring probe, surface contamination, surface treatment of the standard, etc. The reported values of the breakaway force and magnetic induction were measured under ideal conditions given by the test environment. However, these values may vary depending on the specific type of environment, where e.g. operating conditions and subsequent wear may affect the effectiveness of the product, the measurement results. The values quoted are therefore to be regarded as indicative and any variation cannot be considered as a defect. In order to determine the exact value of the magnetic induction and breakaway force in a particular case, it is necessary to carry out the actual measurement. If the values of the breakaway force are not sufficient for you, because they do not correspond to the stated values, you can use the guaranteed return option within 30 days under the conditions stated in the terms and conditions and purchase another type of magnetic separator. These 30 days are just for testing the goods, after which the seller may refuse the return.

Copyright:

We do not agree, do not wish and do not hereby grant anyone any consent to copy individual parts or the whole text. It is also forbidden to alter the text by using identical phrases with the resulting similarity of meaning and correspondence to our text. We do not wish and do not agree to any placement of our text anywhere on other websites, in professional journals, studies, theses in secondary schools and universities without the prior consent of Magsy. If you wish to use our text or parts of it, please contact us at any time.